### Create MainWindow with Text Converter Example in Go

Source: https://context7.com/lxn/walk/llms.txt

Demonstrates creating a main application window using Walk's declarative API. This example includes a menu, status bar, text input/output areas, and a button to convert text to uppercase. It requires the 'github.com/lxn/walk' and 'github.com/lxn/walk/declarative' packages.

```go
package main

import (
    "log"
    "strings"

    "github.com/lxn/walk"
    . "github.com/lxn/walk/declarative"
)

func main() {
    var mw *walk.MainWindow
    var inTE, outTE *walk.TextEdit

    if _, err := (MainWindow{
        AssignTo: &mw,
        Title:    "Text Converter",
        MinSize:  Size{600, 400},
        Size:     Size{800, 600},
        Layout:   VBox{},
        MenuItems: []MenuItem{
            Menu{
                Text: "&File",
                Items: []MenuItem{
                    Action{
                        Text:        "E&xit",
                        Shortcut:    Shortcut{walk.ModControl, walk.KeyQ},
                        OnTriggered: func() { mw.Close() },
                    },
                },
            },
        },
        StatusBarItems: []StatusBarItem{
            {Text: "Ready"},
        },
        Children: []Widget{
            HSplitter{
                Children: []Widget{
                    TextEdit{AssignTo: &inTE},
                    TextEdit{AssignTo: &outTE, ReadOnly: true},
                },
            },
            PushButton{
                Text: "Convert to Uppercase",
                OnClicked: func() {
                    outTE.SetText(strings.ToUpper(inTE.Text()))
                },
            },
        },
    }).Run(); err != nil {
        log.Fatal(err)
    }
}
```

--------------------------------

### Go ComboBox and LineEdit Input Widgets Example

Source: https://context7.com/lxn/walk/llms.txt

This Go code snippet demonstrates how to create and configure ComboBox and LineEdit widgets using the walk library. It includes examples for basic text input, password fields, dropdown selections with data binding, and editable combo boxes with placeholder text and case conversion.

```go
package main

import (
    "fmt"

    "github.com/lxn/walk"
    . "github.com/lxn/walk/declarative"
)

type Country struct {
    Code string
    Name string
}

func main() {
    countries := []*Country{
        {"US", "United States"},
        {"CA", "Canada"},
        {"UK", "United Kingdom"},
        {"DE", "Germany"},
    }
    var nameLe, searchLe *walk.LineEdit
    var countryCb *walk.ComboBox

    MainWindow{
        Title:   "Input Widgets",
        MinSize: Size{400, 200},
        Layout:  Grid{Columns: 2},
        Children: []Widget{
            Label{Text: "Name:"},
            LineEdit{
                AssignTo:    &nameLe,
                CueBanner:   "Enter your full name",
                MaxLength:   50,
                OnTextChanged: func() {
                    fmt.Printf("Name: %s\n", nameLe.Text())
                },
            },

            Label{Text: "Password:"},
            LineEdit{
                PasswordMode: true,
                CueBanner:    "Enter password",
            },

            Label{Text: "Country:"},
            ComboBox{
                AssignTo:      &countryCb,
                Model:         countries,
                BindingMember: "Code",
                DisplayMember: "Name",
                OnCurrentIndexChanged: func() {
                    if i := countryCb.CurrentIndex(); i >= 0 {
                        fmt.Printf("Selected: %s\n", countries[i].Name)
                    }
                },
            },

            Label{Text: "Search:"},
            ComboBox{
                AssignTo: &searchLe,
                Editable: true,
                Model:    []string{"Recent 1", "Recent 2", "Recent 3"},
            },

            Label{Text: "Code:"},
            LineEdit{
                CaseMode: CaseModeUpper,
                MaxLength: 10,
            },
        },
    }.Run()
}

```

--------------------------------

### Implement Actions and Menus in Walk (Go)

Source: https://context7.com/lxn/walk/llms.txt

This Go code demonstrates how to define and use actions within a Walk application's menu and toolbar. It showcases setting text, images, shortcuts, and handling triggered events. The example includes file and edit menus with various actions, and a toolbar referencing these actions.

```go
package main

import (
    "github.com/lxn/walk"
    . "github.com/lxn/walk/declarative"
)

func main() {
    var mw *walk.MainWindow
    var openAction, saveAction, cutAction, copyAction *walk.Action
    modified := false

    MainWindow{
        AssignTo: &mw,
        Title:    "Actions Demo",
        MinSize:  Size{600, 400},
        Layout:   VBox{},
        MenuItems: []MenuItem{
            Menu{
                Text: "&File",
                Items: []MenuItem{
                    Action{
                        AssignTo:    &openAction,
                        Text:        "&Open...",
                        Image:       "open.png",
                        Shortcut:    Shortcut{walk.ModControl, walk.KeyO},
                        OnTriggered: func() { /* open file */ },
                    },
                    Action{
                        AssignTo:    &saveAction,
                        Text:        "&Save",
                        Image:       "save.png",
                        Shortcut:    Shortcut{walk.ModControl, walk.KeyS},
                        Enabled:     Bind("modified"),
                        OnTriggered: func() { modified = false },
                    },
                    Separator{},
                    Action{
                        Text:        "E&xit",
                        Shortcut:    Shortcut{walk.ModAlt, walk.KeyF4},
                        OnTriggered: func() { mw.Close() },
                    },
                },
            },
            Menu{
                Text: "&Edit",
                Items: []MenuItem{
                    Action{
                        AssignTo:    &cutAction,
                        Text:        "Cu&t",
                        Shortcut:    Shortcut{walk.ModControl, walk.KeyX},
                        OnTriggered: func() { /* cut */ },
                    },
                    Action{
                        AssignTo:    &copyAction,
                        Text:        "&Copy",
                        Shortcut:    Shortcut{walk.ModControl, walk.KeyC},
                        OnTriggered: func() { /* copy */ },
                    },
                    Action{
                        Text:        "&Paste",
                        Shortcut:    Shortcut{walk.ModControl, walk.KeyV},
                        OnTriggered: func() { /* paste */ },
                    },
                },
            },
        },
        ToolBar: ToolBar{
            ButtonStyle: ToolBarButtonImageBeforeText,
            Items: []MenuItem{
                ActionRef{&openAction},
                ActionRef{&saveAction},
                Separator{},
                ActionRef{&cutAction},
                ActionRef{&copyAction},
            },
        },
        Children: []Widget{
            TextEdit{
                OnTextChanged: func() { modified = true },
            },
        },
    }.Run()
}

```

--------------------------------

### Create Modal Dialog for Data Entry in Go

Source: https://context7.com/lxn/walk/llms.txt

Illustrates creating a modal dialog window for editing person data using Walk's declarative API. This example includes data binding for form fields (Name, Email, Age) and standard OK/Cancel buttons. It requires the 'github.com/lxn/walk' and 'github.com/lxn/walk/declarative' packages.

```go
package main

import (
    "log"

    "github.com/lxn/walk"
    . "github.com/lxn/walk/declarative"
)

type Person struct {
    Name  string
    Email string
    Age   int
}

func RunPersonDialog(owner walk.Form, person *Person) (int, error) {
    var dlg *walk.Dialog
    var db *walk.DataBinder
    var acceptPB, cancelPB *walk.PushButton

    return Dialog{
        AssignTo:      &dlg,
        Title:         "Edit Person",
        DefaultButton: &acceptPB,
        CancelButton:  &cancelPB,
        MinSize:       Size{300, 200},
        Layout:        VBox{},
        DataBinder: DataBinder{
            AssignTo:       &db,
            DataSource:     person,
            ErrorPresenter: ToolTipErrorPresenter{},
        },
        Children: []Widget{
            Composite{
                Layout: Grid{Columns: 2},
                Children: []Widget{
                    Label{Text: "Name:"},
                    LineEdit{Text: Bind("Name")},
                    Label{Text: "Email:"},
                    LineEdit{Text: Bind("Email")},
                    Label{Text: "Age:"},
                    NumberEdit{Value: Bind("Age"), Suffix: " years"},
                },
            },
            Composite{
                Layout: HBox{},
                Children: []Widget{
                    HSpacer{},
                    PushButton{
                        AssignTo: &acceptPB,
                        Text:     "OK",
                        OnClicked: func() {
                            if err := db.Submit(); err != nil {
                                log.Print(err)
                                return
                            }
                            dlg.Accept()
                        },
                    },
                    PushButton{
                        AssignTo:  &cancelPB,
                        Text:      "Cancel",
                        OnClicked: func() { dlg.Cancel() },
                    },
                },
            },
        },
    }.Run(owner)
}
```

--------------------------------

### TreeView: Display Hierarchical Data with Lazy Loading in Go

Source: https://context7.com/lxn/walk/llms.txt

This Go code demonstrates how to implement a TreeView component to display hierarchical data, such as a file system. It utilizes the TreeModel interface for lazy loading of child nodes, improving performance for large datasets. The example defines a DirNode struct to represent nodes and a DirTreeModel to manage the data.

```go
package main

import (
    "log"
    "os"
    "path/filepath"

    "github.com/lxn/walk"
    . "github.com/lxn/walk/declarative"
)

type DirNode struct {
    name     string
    parent   *DirNode
    children []*DirNode
}

func (d *DirNode) Text() string { return d.name }
func (d *DirNode) Parent() walk.TreeItem {
    if d.parent == nil { return nil }
    return d.parent
}
func (d *DirNode) ChildCount() int {
    if d.children == nil { d.loadChildren() }
    return len(d.children)
}
func (d *DirNode) ChildAt(i int) walk.TreeItem { return d.children[i] }
func (d *DirNode) Image() interface{}          { return d.path() }

func (d *DirNode) path() string {
    if d.parent == nil { return d.name }
    return filepath.Join(d.parent.path(), d.name)
}

func (d *DirNode) loadChildren() {
    entries, _ := os.ReadDir(d.path())
    for _, e := range entries {
        if e.IsDir() {
            d.children = append(d.children, &DirNode{name: e.Name(), parent: d})
        }
    }
}

type DirTreeModel struct {
    walk.TreeModelBase
    roots []*DirNode
}

func (m *DirTreeModel) RootCount() int               { return len(m.roots) }
func (m *DirTreeModel) RootAt(i int) walk.TreeItem   { return m.roots[i] }
func (m *DirTreeModel) LazyPopulation() bool         { return true }

func main() {
    model := &DirTreeModel{roots: []*DirNode{{name: "C:\\"}}}
    var tv *walk.TreeView

    MainWindow{
        Title:  "Directory Browser",
        Size:   Size{400, 600},
        Layout: VBox{MarginsZero: true},
        Children: []Widget{
            TreeView{
                AssignTo: &tv,
                Model:    model,
                OnCurrentItemChanged: func() {
                    if item := tv.CurrentItem(); item != nil {
                        log.Printf("Selected: %s", item.(*DirNode).path())
                    }
                },
            },
        },
    }.Run()
}

```

--------------------------------

### System Tray Integration with NotifyIcon in Go

Source: https://context7.com/lxn/walk/llms.txt

Shows how to integrate an application with the Windows system tray using the NotifyIcon component. This includes setting an icon, tooltip, handling click events to display balloon notifications, and managing a context menu with actions like showing the main window or exiting the application. Requires the 'github.com/lxn/walk' package.

```go
package main

import (
    "log"

    "github.com/lxn/walk"
)

func main() {
    mw, _ := walk.NewMainWindow()

    // Load icon from file or resource
    icon, err := walk.Resources.Icon("app.ico")
    if err != nil {
        log.Fatal(err)
    }

    // Create notify icon
    ni, _ := walk.NewNotifyIcon(mw)
    defer ni.Dispose()

    ni.SetIcon(icon)
    ni.SetToolTip("My Application - Click for menu")

    // Handle left click - show balloon
    ni.MouseDown().Attach(func(x, y int, button walk.MouseButton) {
        if button == walk.LeftButton {
            ni.ShowInfo("Application Status", "Everything is running smoothly!")
        }
    })

    // Create context menu
    showAction := walk.NewAction()
    showAction.SetText("&Show Window")
    showAction.Triggered().Attach(func() { 
        mw.Show()
        mw.Restore()
    })

    exitAction := walk.NewAction()
    exitAction.SetText("E&xit")
    exitAction.Triggered().Attach(func() { walk.App().Exit(0) })

    ni.ContextMenu().Actions().Add(showAction)
    ni.ContextMenu().Actions().Add(walk.NewSeparatorAction())
    ni.ContextMenu().Actions().Add(exitAction)

    ni.SetVisible(true)
    ni.ShowInfo("Started", "Application is now running in the system tray.")

    mw.Run()
}
```

--------------------------------

### Walk Layout Managers: VBox, HBox, Grid, Flow in Go

Source: https://context7.com/lxn/walk/llms.txt

Demonstrates the usage of various layout managers in the Walk GUI toolkit for arranging widgets. Supports vertical (VBox), horizontal (HBox), grid, and flow layouts with options for margins, spacing, and alignment. No external dependencies beyond the Walk library.

```go
package main

import (
    "log"

    . "github.com/lxn/walk/declarative"
)

func main() {
    MainWindow{
        Title:   "Layout Examples",
        MinSize: Size{400, 300},
        Layout:  VBox{Margins: Margins{10, 10, 10, 10}, Spacing: 10},
        Children: []Widget{
            // Horizontal layout with buttons
            Composite{
                Layout: HBox{SpacingZero: true},
                Children: []Widget{
                    PushButton{Text: "Left"},
                    HSpacer{},
                    PushButton{Text: "Right"},
                },
            },
            // Grid layout for form
            GroupBox{
                Title:  "User Details",
                Layout: Grid{Columns: 2, Spacing: 6},
                Children: []Widget{
                    Label{Text: "First Name:"},
                    LineEdit{},
                    Label{Text: "Last Name:"},
                    LineEdit{},
                    Label{Text: "Address:", Row: 2, Column: 0},
                    TextEdit{Row: 2, Column: 1, RowSpan: 2, MinSize: Size{0, 60}},
                },
            },
            // Flow layout for tags
            Composite{
                Layout: Flow{},
                Children: []Widget{
                    PushButton{Text: "Tag 1"},
                    PushButton{Text: "Tag 2"},
                    PushButton{Text: "Tag 3"},
                    PushButton{Text: "Tag 4"},
                },
            },
        },
    }.Run()
}

```

--------------------------------

### Custom Canvas Drawing with GDI+ in Go

Source: https://context7.com/lxn/walk/llms.txt

Demonstrates custom drawing operations on a canvas within a Walk application. It utilizes GDI+ primitives to draw borders, fill shapes with patterns, render a sine wave, and display text. This requires the 'github.com/lxn/walk' package.

```go
package main

import (
    "math"

    "github.com/lxn/walk"
    . "github.com/lxn/walk/declarative"
)

func main() {
    MainWindow{
        Title:   "Custom Drawing",
        MinSize: Size{400, 400},
        Layout:  VBox{MarginsZero: true},
        Children: []Widget{
            CustomWidget{
                ClearsBackground:    true,
                InvalidatesOnResize: true,
                Paint: func(canvas *walk.Canvas, bounds walk.Rectangle) error {
                    // Draw border
                    pen, _ := walk.NewCosmeticPen(walk.PenSolid, walk.RGB(0, 0, 0))
                    defer pen.Dispose()
                    canvas.DrawRectangle(pen, bounds)

                    // Fill ellipse with pattern
                    brush, _ := walk.NewHatchBrush(walk.RGB(0, 100, 200), walk.HatchCross)
                    defer brush.Dispose()
                    canvas.FillEllipse(brush, walk.Rectangle{
                        X: bounds.Width/4, Y: bounds.Height/4,
                        Width: bounds.Width/2, Height: bounds.Height/2,
                    })

                    // Draw sine wave
                    linePen, _ := walk.NewCosmeticPen(walk.PenSolid, walk.RGB(255, 0, 0))
                    defer linePen.Dispose()
                    points := make([]walk.Point, bounds.Width)
                    for x := 0; x < bounds.Width; x++ {
                        y := int(float64(bounds.Height/2) +
                            math.Sin(float64(x)*0.05)*float64(bounds.Height/4))
                        points[x] = walk.Point{X: x, Y: y}
                    }
                    canvas.DrawPolyline(linePen, points)

                    // Draw text
                    font, _ := walk.NewFont("Arial", 16, walk.FontBold)
                    defer font.Dispose()
                    canvas.DrawText("Custom Drawing", font, walk.RGB(0, 0, 0),
                        bounds, walk.TextCenter)

                    return nil
                },
            },
        },
    }.Run()
}
```

--------------------------------

### Walk TableView: Data Grid Widget in Go

Source: https://context7.com/lxn/walk/llms.txt

Implements a data grid using Walk's TableView widget. Supports sorting, multi-selection, and custom cell formatting. Data is managed via a custom TableModel implementing the TableModel interface. Requires the Walk library.

```go
package main

import (
    "fmt"
    "sort"
    "time"

    "github.com/lxn/walk"
    . "github.com/lxn/walk/declarative"
)

type Item struct {
    Name      string
    Price     float64
    Quantity  int
    UpdatedAt time.Time
}

type ItemModel struct {
    walk.TableModelBase
    walk.SorterBase
    items []*Item
}

func (m *ItemModel) RowCount() int                   { return len(m.items) }
func (m *ItemModel) Value(row, col int) interface{} {
    item := m.items[row]
    switch col {
    case 0: return item.Name
    case 1: return item.Price
    case 2: return item.Quantity
    case 3: return item.UpdatedAt
    }
    return nil
}

func (m *ItemModel) Sort(col int, order walk.SortOrder) error {
    sort.SliceStable(m.items, func(i, j int) bool {
        a, b := m.items[i], m.items[j]
        less := a.Name < b.Name
        if order == walk.SortDescending { less = !less }
        return less
    })
    return m.SorterBase.Sort(col, order)
}

func main() {
    model := &ItemModel{
        items: []*Item{
            {"Widget A", 29.99, 100, time.Now()},
            {"Widget B", 49.99, 50, time.Now().Add(-24 * time.Hour)},
            {"Widget C", 19.99, 200, time.Now().Add(-48 * time.Hour)},
        },
    }
    var tv *walk.TableView

    MainWindow{
        Title:  "Inventory",
        Size:   Size{600, 400},
        Layout: VBox{MarginsZero: true},
        Children: []Widget{
            TableView{
                AssignTo:         &tv,
                AlternatingRowBG: true,
                ColumnsOrderable: true,
                MultiSelection:   true,
                Columns: []TableViewColumn{
                    {Title: "Name", Width: 150},
                    {Title: "Price", Format: "$%.2f", Alignment: AlignFar, Width: 80},
                    {Title: "Qty", Alignment: AlignCenter, Width: 60},
                    {Title: "Updated", Format: "2006-01-02", Width: 100},
                },
                Model: model,
                OnSelectedIndexesChanged: func() {
                    fmt.Printf("Selected: %v\n", tv.SelectedIndexes())
                },
            },
        },
    }.Run()
}

```

--------------------------------

### DataBinder: Implement Two-Way Data Binding in Go with Walk

Source: https://context7.com/lxn/walk/llms.txt

This Go code illustrates the use of Walk's DataBinder for automatic synchronization between UI controls and Go struct fields. It includes data validation and error presentation using ToolTipErrorPresenter. Changes in the UI are submitted to the DataSource when the Submit() method is called.

```go
package main

import (
    "fmt"
    "log"
    "time"

    "github.com/lxn/walk"
    . "github.com/lxn/walk/declarative"
)

type Order struct {
    CustomerName string
    ProductID    int
    Quantity     int
    Priority     bool
    Notes        string
    OrderDate    time.Time
}

type Product struct {
    ID   int
    Name string
}

func main() {
    order := &Order{OrderDate: time.Now()}
    products := []*Product{{1, "Laptop"}, {2, "Mouse"}, {3, "Keyboard"}}
    var db *walk.DataBinder

    MainWindow{
        Title:   "Order Form",
        MinSize: Size{400, 300},
        Layout:  VBox{},
        DataBinder: DataBinder{
            AssignTo:       &db,
            DataSource:     order,
            ErrorPresenter: ToolTipErrorPresenter{},
        },
        Children: []Widget{
            Composite{
                Layout: Grid{Columns: 2},
                Children: []Widget{
                    Label{Text: "Customer:"},
                    LineEdit{Text: Bind("CustomerName")},

                    Label{Text: "Product:"},
                    ComboBox{
                        Value:         Bind("ProductID", SelRequired{}),
                        BindingMember: "ID",
                        DisplayMember: "Name",
                        Model:         products,
                    },

                    Label{Text: "Quantity:"},
                    NumberEdit{Value: Bind("Quantity", Range{1, 100})},

                    Label{Text: "Order Date:"},
                    DateEdit{Date: Bind("OrderDate")},

                    Label{Text: "Priority:"},
                    CheckBox{Checked: Bind("Priority")},

                    Label{Text: "Notes:", ColumnSpan: 2},
                    TextEdit{Text: Bind("Notes"), ColumnSpan: 2, MinSize: Size{0, 60}},
                },
            },
            PushButton{
                Text: "Submit Order",
                OnClicked: func() {
                    if err := db.Submit(); err != nil {
                        log.Print(err)
                        return
                    }
                    fmt.Printf("Order: %+v\n", order)
                },
            },
        },
    }.Run()
}

```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.